Compounds containing active oxygen.



UNITED STATES PATENT onnion.

OTTO LIEBKNEGHT, F F-BANKFORT-ON-TH'E-MAIN, GERMANY, ASSIGNOR TOWTHE ROESSLER & HASSLACHER CHEMICAL so, or NEW YORK, N. Y., A GORPORATIONIOF -NEW YORK.

No Drawing.

To all whom it may concern Be it known that I, OTTO LIEBKNECHT, a

. subject of the Emperor of Germany, residing at Frankfort-on-the-Main, Germany, .have invented certain new and useful Improvements in Compounds Containing Active Oxygen, of which the following is a full, clear, and exact specification.

' This invention relates to new compounds containing active oxygen in the form of a persalt and a base other than an alkali metal,

such as magnesium.

In U. S. Patents #816,925 and #842,470

' heretofore issued to me, I have described the manufacture of magnesium perborate and sodium perborate respectively. In course of time it has been found that sodium perborate as well as magnesium perborate each have their own shortcomings. It has furthermore been found that the general properties of sodium perborate in various particulars make it'the more desirable substance provided its stability can be increased without sacrificing any of its advantages.

In the researches concerning the manufacture of perborates I have now found a new process by which I may produce a perborate salt of desirable stability, containing both sodium and magnesium.

The advantages of my new process are great and important as it immediately turns out products having superior properties, the new salt especially possessing the great advantage over the sodium perborate of being greatly resistant-to the decomposing effect exerted by catalyzers. Solutions containing said new salt are mainly 1ntended for use in bleaching establishments which very oftenemploy copper vessels, the walls of which act as a catalyzer on substancescontammg active oxygen, butit has been found that the new salt obtained by the process described below is not effected by the copper and only very gradually splits off its oxygen. The mother lyes in my process may easily be -evaporated without sustaining any noticeable loss of oxygen: Finally I may say the new salt greatly facilitates the manufacturing operations owing to its crystalline form,

thus easily permitting separation from the p from the spirit of the lnvention inasmuchas mother lye, while the amorphous form of the plain magnesium-perborates 'is very troublesome.

The compounds produced by my new proc COMPOUNDS CONTAINING ACTIVE OXYGEN...

Specification of Letters Patent. Patented May 30, 1916 Application filed December 24, 1913. Serial No. 808,582.

less magnesium according to the quantity of magnesium salts added to the charge.

To carry my invention into effect I may proceed .as illustrated by the following example: 630 parts of borax with 132 parts of sodium hydrate are dissolved in 4000 parts of water, whereupon 1000 parts of a 22.6% solution of hydrogen peroxid are added, the solution being cooled during the addition to prevent any considerable rise in temperature. After the produced perborate has nearly all separatedout of the liquor a solution of 110 gr. magnesium chlorid (MgCh-l-(SHO) is introduced. The mixture is stirred for about one hourwhen the precipitated salt-is-separated from the lye by filtration and is directly dried without being washed. The magnesium chlorid may also be substituted by a corresponding quantity of another magnesium compound, like magnesium sulfate, magnesium hydroxid, etc., though said quantity may be reduced or increased as the situation may require. Fun thermore the magnesiumsalt may be added at any stage of the process. a

I have not yet been able to decide whether the magnesium contained in the product obtained by this process, penetrates into the molecule of sodium perborate or whether it covers only the crystallized perborate with it holds good also of the known alkali perborates in general and as the magnesium compounds mentioned above may finally be substituted altogether by any compounds the ba?se of which is not an alkali metal and is able to form perborate salts, as for instance zinc compounds, etc., which variations are 5 claimed to come within the scope of the invention.

What I claim and desire to secure by Letters Patent is:

1. As a new product, a stable perborate in o'the form of a double salt consisting of an alkali perborate and another perborate the base of which is other than an alkali metal.

2. As a new product, a stable perboratein the form of-a stable salt consisting of sodium 1; perborate and another perborate the base of which is other than an alkali metal.

. 3.-The' process of manufacturing a stable sodium perborat containing -a magnesium compound consistlng 1n reacting on sodlum perborate wlth a magnesium compound.

4. As a new product, a stable sodium per specification inthe presence of two subscribmg witnesses.

OTTO LIEBKNECHT. Witnesses: JEAN GRUND, CARL GRUND. 

